Hey guys, I'm pretty new to the forums.
I had no idea that the base Z only came with two speakers... I was honestly very, very disappointed.
I picked up some JBL speakers and installed them at my shop. Also cut holes for my tweeters and rewired the system. Sounds great, and I'm probably going to add 2 10" orion XTR pro speakers in the near future. Just thought I would share some photos and get your opinion!
I also noticed that there's a spot for rear speakers but none are there...
Wired in some 3 1/2 JBL speakers and now it sounds great!

Terrible stock speakers..

JBL 6 1/2

JBL 3 1/2

crossovers

Crossover close up

JBL 6 1/2 installed

Driver side setup

Had to shave more off but it fit

BEFORE

Cutting

AFTER